Exchange ratio : বিনিময় অনুপাত;
Related Words
exchange greetings  exchange rate  exchange ratio  See Words Also In
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Appropriate Prepositions
Bask in(রোদ পোহানো): The boys and girls are basking in the sun right now.
Contrary to(বিপরীত, পরিপন্থী): Students should not act contrary to the rules of discipline.
Deaf to, of, in (না শোনা, বধির হওয়া): The boy is deaf to his father’s advice. This man is deaf of/in one ear.
Devote to (উৎসর্গ করা/নিয়োজিত করা): Students should devote sufficient time to their studies.
Inquire for (দেখা করতে চাওয়া): He inquires for the manager.
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Idioms
At the top of (শীর্ষে): The boy shouted at the top of his voice.
As a whole (মোটের উপর, সম্পূর্ন এক মনে করে-adv.) Look at life as a whole and you will see that it is meaningful.
Lion’s share (বড় মাপের অংশ): He took the lion’s share of the profit.
Silver living (hope- আশা বা ভালো দিক): Every cloud has a silver lining.
To the contrary (against what some one had said, পক্ষান্তরে) —He said nothing to the contrary.